Question about tunnels, IPsec and redirect

Kevin Wilson wkevils at
Tue Sep 24 14:52:03 EDT 2013

I am looking at this patch:
and I cannot understand it. Can somebody please try
to explain ?
more specifically:
Can somebody please give an example of some setup of IPsec tunnel
where the ip_rt_send_redirect() method should not be called when the
skb->sp is not NULL ?
(in other words, why if the SKB is and IPsec SKB, we should not send a
redirect in such a case while forwarding a packet; note I am talking
about  IPv4)

Note that the check for skb->sp was changed in recent kernels to
skb_sec_path(skb), but it is essentially the same.


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